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css四中定位总结备忘_html/css_WEB-ITnose

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Release： 2016-06-24 11:44:19
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css布局的核心是position属性，position：static || relative || absolute || fixed


static是默认的属性


相对定位：

相对定位相对的是它原来在文档中的位置（或者默认位置）。接下来，可以使用top、right、bottom、left属性来改变它的位置。


绝对定位三特性：

1.设置成绝对定位后默认的宽度变成内容宽度

2.设置成绝对定位的部分脱离文档流

3.绝对定位的默认参照物为第一定位祖先/根元素


固定定位：

固定定位元素的上下文是视窗，它不会随页面的滚动而移动。固定定位并不常用，最常见的情况是用它创建不随页面滚动而移动的导航元素。

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css四中定位总结备忘
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